Arc-lamp.



Patented Oct. 15

3 SHEETSSHEET 1- ATTbRNEY rm: mmnls rsmns ca. mmmmmm WASIIINGYON. u c.

C. AALBORG.

ARC LAMP.

APPLICATION FILED MAR. 20, 1913.

Patented Oct. 15, 1918.

3 SHEETS-SHEET 2.

a INVEN TQR M ATTORNEY C. AALBORG.

ARC LAMP.

APPLICATION FILED MAR, 20. 1913.

3 SHEETS-SHEET 3- Patented Oct. 15, 1918.

ATTORNEY PEYERS m. Pm'm Lnml, wuumnmm A Q UNITED STATES PATENT OFFICE.

cnnisrrnn AAL'Bone, or w LKINsB ne, rEnNsYLvan'IA, assrenon-rownsrrnenousnnnncrnrc AND manumcruame COMPANY,- ACORPORATION *or PENN- SYLVANIA.

ABC-LAMP.

Specification of Letters Patent.

Patented Oct. 15, 1918.

To allwh'om it may concern:

' Be it known that I, Crims'rmn AALBoac, a citizen of the United States, and a resident of \Vilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Arc- Lamps, of which the'following is "a specification. I

My invention relates to are lamps and particularly to the construction ofthefeeding and the regulating mechanisms thereof.

- he'object of my invention is to provide simple and compact mechanisms for "feeding the electrodes and for regulatin the distance between the arcing ends the elec' trodes that shall be of such a character as to permit of decreasing the length of the lamp with respect to similar lamps heretofore constructed.

An effective saving in the over-all length of an arc lamp may be accomplished when one of the electrodes to be usedis substantially shorter than the other as a result of the different rates of consumption of the electrodes. In arc lamps in which both electrodes have the same composition and diameter and in which the rate of consumption of one of the electrodes appreciably exceeds that of the other, as in carbon flame arc lamps, it is economical, as regards the cost of mamtenance and as regards the over-all length of the lamp, to use the stub of the initially longer and more rapidly consumed electrode for the less rapidly consumed electrode of the succeeding trim, while a new electrode replaces the said stub. Although my invention relates to are lamps in which electrodes may be utilized as above indicated, it particularly relates to lamps which are to be provided with mechanisms that permit a material decrease in'the over-all length of the lam For a better understanding of my invention, reference may be had to the accompanying drawings and the following description of a form of my invention in which Figure 1 is a View in elevation of a substantially completely assembled'arc lamp with casing and'globes in section; Fig. 2 is a plan view, partially in sectiomtaken along the line A-A of Fig. 1; Figs. 3 and 4 are views ofa front elevation and a sectional side elevation,'respectively, of a portion of an assembled holder for the upper electrode, Fig. 5 is a diagrannna-tic'sketchof the electric circuits embodied in the lamp,'and Figs. 6 and 7 are front and side views, respectively,of the essential features comprising the regulating mechanism of the lamp.

p Referring to Figs. 1, 6 and 7, a chamber 1, containing feeding and regulating mechanisms-is inclosed by a casing 2, a cap 3, and an inverted hood 4; An upper supporting platform'or disk 5, from which a large portion of the mechanism is suspended, is rigidly secured to the'cap 3 by the engagement of screws 6 with bosses 7. which are integrally formed'on the cap. A lower support-' ing plate or disk'S is supported from the upper disk 5 by'two pairs of tie-rods 9 and 10 and 11 andj12, which also act as guiding means for electrode holders, as hereinafter described.

Positioned on the underside of the disk 5 is a support 13, provided at its upper portion, with laterally and outwardly extending arms 14 and 15 into which are journaled, respectively, double integral pulleys 16 and 17 and 18 and 19 and, at its lower portion, with journals for guide pulleys 20 and 21, the grooves in which aline respectively with the grooves in the small-diameter pulleys 17 and 19. The support 13 permits the spacing apart of the pulleys 16 and 17 from the pulleys 18 and 19 which allows an upper electrode 22 to extend substantially to the under surface of the disk 5. As shown in Figs. 1 and 2, slots may be formed in the disk 5 immediately ELbOX Q the largerdiameter pulleys 16 and 18 through which the said pulleys partially project, thus effecting some saving in space.

Flexible members or chains 23 and 24 are secured, at one end, to the peripheries of the respective pulleys 16 and 18 and, at the other end, to a carriage 25 for the upper electrode 22, the said chains engaging with grooves formed on the circumferences of the said pulleys. A carriage 26 for the lower electrode 27 is connected to the pulleys17 and 19 by means of chains 28 and 29 which also engagegrooves formed on the pulley For focusing or maintaining the are in a constant position throughout the trim, the pulleys 16 and 18 have larger diameters than the pulleys 17 and 19, and the ratlo between the two differently dimensioned di ameters is equal to the ratio of the relative consumption of the two electrodes. feeding operation, the electrode 22, being connected to the larger-diameter pulleys, is fed into the arc in proportion to its more rapid rate of consumption, while the lower electrode 27 is fed in proportion to its less rapid rate of consumption.

The positioning of the support 13, with its pulleys, is such that'the chains 23 and 24 overhang, from their supporting pulleys 16 and 18, in a plane parallel to the axis of the upper electrode 22; while the chains 28 and 29, which are hung from the pulleys l7 and 19 on a side ofthe axis of rotation of the pulleys opposite to the chains 23 and 24, engage the guide pulleys 20 and 21 which assist in properly directing the travel ofthe carriage of the lower electrode.

The carriage 25 of the upper electrode 22 extends cross-wise between the tie-rods 9 and 10 which engage slots 30 formed in the outwardly extending arms of the carriage and which act as guides therefor. Sliding engagement between the carriage and the rods is effected when the chains connected to the carriage are either wound upon or unwound from their pulleys. Simultaneous withthe movement of the carriage 25 of the upper electrode, the carriage 26 of the lower electrode slidingly engages the tie-rods 11 and 12, which act as its guiding means, and moves in a direction opposite to the direction of movement of the carriage of the upperelectrode. A holder 31 for the lower electrode 27 is connected to the carriage 26 by means of a tubular member 32, said member passing slidingly through a sleeve 33 that extends through an opening in the lower supporting plate 8. By means of an insulating bushing 34 that engages the sleeve, and other insulating means (not shown), the tubular member 32 and the lower electrode 27 are insulated from the frame ofthe lamp.

Holder 31 for the lower electrode com-l prises a support 35 which is provided with a V-shaped indentation so as to grip firmly the electrode 27 when it is pressed against the support by means of thumb screws 36 which engage a flat rectangular-shaped bar 37, said screws passing through openings in the bar and screwing into extensions integrally formed in the support 35. A wire In the bail 38 is positioned to prevent the electrode from sliding from the holder 31.

In conjunction with the Figs. 1 and 2, reference may be had to Figs. 3 and 4 which are views of the assembly of the carriage and holder for the upper electrode. The

chains 23 and 24 being connected to lugs 39,

cylindrical projections 44 on the said holder by means of steel springs 45 and 46, disposed as shown inFig. 4. An electrode stop 47, comprising a vertical piece and a horizontal extension at its upper end, is positioned upon the holder 43 to prevent the electrodes from moving upward in said holder beyond a predetermined distance.

On the underside of the disk 5, is held a pair oftubular magnet coils 48 and 49 with their axes parallel to the direction of the guide members 9 and 10, said coils being held, rigidly in position by upper spool plates 50 and 51fand lower spool plates 52 and 53 which are connected to therods 9 and 10 by means of supporting straps 54 and 55, thus holding the axes of the spools in alinement with the direction ofmotion of a coiiperating Ushaped armature 56, the legs. of which extend into the tubular coils. A core stop 57 is held upon the lower spool plates and ispositioned to prevent the armature 56 from exceeding its predetermined downward movement. By means of a mutual connection between the armature 56 and a movable piston member 58, which engages a fixed shell member 59 of the dash pot, rapid fluctuations that may occur in retarded. The link 60 is secured to the ar-' mature and to the piston bymeans of screws 61 and 62, respectively. The shell member of the dash pot is suspended from the disk 5 by means of a suspending bracket 63 and a screw 64. a

To the lower end of the link 60 is connected, by means of a cotter pin 65, a clutch holder 66 which surrounds and engages loosely a clutch ring 67, said ring permitting the electrode 22 to slide through ring is positioned normally upon a projection of an economizer 68, as shown in Fig. 1. The clutch holder is pivotally secured to the link 60, and any movement of the link causing the clutch holder to alter its normal position, operatively engages the clutch ring 67 with the electrode 22. When the legs of the armature 56 are drawn into the it when the.

tubular coils 48 and 49, the upward movement is transmitted tothe electrode 22, separating the said electrode from the lower electrode 27 and drawing an arc between their adjacent ends. The engagement between the clutch ring and the electrode 22 continues until the clutching device is returned again to its normal position.

The distance that the electrode 22 moves away from the electrode 27 is dependent upon the predetermined length of the are required for operating conditions and is adjusted, in this instance, by regulating the weight of the armature 56, thus permitting it to ascend into the tubular magnets a predetermined amount and thereby separating the electrodes the predetermined distance. The electrodes used in this lamp have a rate of consumption so slow that the increase in arc length occurring in the nprmal period of continuous operation is so slight as not to require the feeding of an electrode during such period. When the arc is extinguished, the circuit of the lamp is interrupted, and the ring 67 returns to its normal position on the extension of the economizer, thus releasing the electrode 22 and permitting it to de scend by reason of the greater weight of the electrode and its associated devices and make electrical contact with the electrode 27, thereby reestablishing the circuit through the lamp.

Flickering of the are caused by unbalanced magnetic fields about the are is prevented by the insertion of a blow coil 69 which is positioned on the upper side of the lower supporting plate 8 and in proximity to the arc. Resistors 70 and 71 are connected in series with the arc in order to insert into the circuit a steadying resistance that insures stability or ballast to the arc. The resistors are made of non-corroding wire wound on porcelain or cement spools and are provided with taps 72 for the adjustment of the resistance required. Each resistance spool is supported at its upper end from the supporting plate 5, and at its lower end by rectangular shaped bars 73 and 7a which are respectively screwed to the guide rods 9 and 10.

Fig. 5 is a diagrammatic view of lamp circuits conforming to my invention, said view comprising, in electrical series, a line terminal 7 5, herein designated as a positive terminal in a direct current circuit, a member 76 secured to a flexible conductor 77, the upper electrode 22, the lower electrode 27 the tubular member 32, the flexible conductor 77, the resistor 70, the two tubular magnet coils 48 and 49, the DlOW-COil 69 and the resistor 71 which terminates in a negative line terminal 78.

While I have shown in Figs. 1 and 2 the detailed construction of a form of my invention, reference may be had to Figs. 6 and 7 trated somewhat in detail one embodiment of my invention, it is not intended that my invention, in all its aspects, shall be limited to this particular embodiment, as it will be apparent to anyone skilled in the art that many changes may be made in the form of my invention without departing from the spirit thereof.

I claim as my invention:

1. All are lamp comprising two alined, cooperating electrodes, a stationary platform, a pair of spaced coaxial double pulleys carried by the said platform upon opposite sides of the path of movement of one of the said electrodes, an electrode holder suspended from the said pulleys, and means for moving the said holder.

2. An arc lamp comprising cooperating electrodes, a pair of rotatably-mounted double pulleys spaced apart upon opposite sides of the path of movement of one of the said electrodes, an electrode holder flexibly secured to said pulleys, guides to direct the movement of said holder, and means for moving the said holder.

3. An arc lamp comprising cooperating electrodes, two double pulleys coaxially mounted upon opposite sides of the path of movement of one of the said electrodes, each of the said pulleys comprising two rigidly connected sections of different diameters, a holder for one of the said electrodes flexibly secured to the pulley sections of larger diameter and a holder for the other electrode flexibly secured to the pulley sections of smaller diameter.

4. An arc lamp comprising vertically alined cooperating electrodes adapted to be consumed unequally, and means for supporting and feeding the said electrodes comprising two double pulleys coaxially mounted upon opposite sides of the path of movement of the said electrodes, each of the said pulleys comprising two rigidly connected sections of different diameters, a holder for the upper electrode flexibly suspended from the pulley sections of larger diameter and a holder for the lower electrode flexibly suspended from the pulley sections of smaller diameter.

5. An arc lamp comprising a housing, an electrode disposed within said housing, pivoted actuating means for said electrode, and flexible suspending means for said electrode engaging said actuating means and attached to said electrode at a point intermediate its ends, said suspending means extending parallel to, but displaced from, the path of movement of said electrode in order that ,In testimony whereof I have hereunto said electrode may pass said actuating means subscribed my name this 14th day of March, to permit the use of an electrode of maxi- 1913.

mum length Within a housing of minimum CHRISTIAN AALBORG. 5 length as determined by the limits imposed Witnesses:

by the correlation of said housing and said S. C. HOEY,

electrode. B. B. HINES.

Copies of this patent may be obtained folfive cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

